SERBIA

I believe this is a Serb 1910 that has been de-ringed. and used by Germany

Only marking is this on the spine

I have included comparison pictures of the hilt with that of an 1895the pommels are slightly longer, the cross guard appears to be the same as the 1895 but the blade is mounted normal way around and the grips are shaped  unlike the Chilean 1895 that has edge down but straight grips

Scabbard has German style frog stud, but has twin throat screws.

Frog seems to be a modification of a WWI Austrian frog made for German 84/98 scabbards, it has however 2 (rusted away) rivets on the rear face

Serbian 1899 double edged bayonet

Made by PLUMB in 1916, this is one of the American made examples, others were made by Yugoslavia and marked AT3 and others

Original frog has had the hilt strap replace higher up the frog